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Title: Sporadic auroras near the geomagnetic equator: in the Philippines, on 27 October 1856
Authors: Hayakawa, Hisashi
Vaquero, José M.
Ebihara, Yusuke  kyouindb  KAKEN_id  orcid (unconfirmed)
Author's alias: 海老原, 祐輔
Issue Date: 29-Aug-2018
Publisher: Copernicus GmbH
Journal title: Annales Geophysicae
Volume: 36
Start page: 1153
End page: 1160
Abstract: While low-latitude auroral displays are normally considered to be a manifestation of magnetic storms of considerable size, Silverman (2003, JGR, 108, A4) reported numerous “sporadic auroras” which appear locally at relatively low magnetic latitude during times of just moderate magnetic activity. Here, a case study is presented of an aurora near the geomagnetic equator based on a report from the Philippine islands on 27 October 1856. An analysis of this report shows it to be consistent with the known cases of sporadic auroras, except for its appearance at considerably low magnetic latitude. The record also suggests that an extremely low-latitude aurora is not always accompanied by large magnetic storms. The description of its brief appearance leads to a possible physical explanation based on an ephemeral magnetospheric disturbance provoking this sporadic aurora.
Rights: © Author(s) 2018. This work is distributed under the Creative Commons Attribution 4.0 License.
DOI(Published Version): 10.5194/angeo-36-1153-2018
Appears in Collections:Journal Articles

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